参考答案：动物对地球至关重要。他们是人类的朋友。
Suggested answer: Animals are important creatures on the earth, and they are friends to people.
狗是人类的朋友，不仅因为他们可爱，而且因为他们忠实于主人。
Dogs are friends of man not only because they are lovely but also because they are faithful to their master.
人类的心理被设计用来填补空白：为什么你认为你总是看到的像你朋友的人会在你进一步了解他们的时候发现他们是另一个人呢？
Human minds were designed to fill gaps: Why do you think you always see people who look like your friends and then when you come closer to them you find them other people?
应用推荐